Figure 3:

The box and whisker plots show the median (solid horizontal line), 25th and 75th percentile (box limits), the 10th and 90th percentiles (whiskers), and the mean (dashed horizontal line) for uterine contractions (A) and melatonin AUC (B) for the each of the two nights in the 2-night protocol under the long- (left two box plots) and short-wavelength (right two box plots) light exposure conditions. Data were compared between light exposure conditions and study days using repeated measures mixed-model regression. * Signifies p<0.0001 between the first and second night within a light exposure condition.